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Targeted drug therapy found effective in patients with common form of immune-mediated kidney disease
Date:8/5/2008

The drug rituximab causes considerable kidney injury healing in patients with membranous nephropathy, a common form of kidney disease, according to a study appearing in the November 2008 issue of the Clinical Journal of the American Society Nephrology (CJASN). The results suggest that this condition, previously destined to progress to kidney failure in 30-40 percent of cases, can actually be healed in some patients.

Membranous nephropathy (also known as membranous glomerulopathy) is one of the most common immune-mediated kidney diseases, and is thought to be caused by autoimmune reactions against the kidney. The disease, which is characterized by the loss of large amounts of protein in the urine, leads to impaired kidney function that may ultimately require dialysis or renal transplantation.

A variety of immunosuppressive drugs have been tested to inhibit the production of the antibodies that attack the kidneys during the progression of membranous nephropathy, but their effects have been inconsistent. These therapies also can cause significant toxicity and can suppress a patient's immune system, exposing the patient to an increased risk of infections and illnesses.

A new drug called rituximab selectively depletes B lymphocytes, the cells that produce the damaging autoantibodies of membranous nephropathy. The drug was initially developed as a cancer treatment for patients with B cell lymphoma, but kidney researchers have shown that this drug also is safe and reduces the amount of protein lost in the urine due to membranous nephropathy. These same researchers, led by Piero Ruggenenti, MD, of the Negri Bergamo Laboratories in Bergamo, Italy, have now provided evidence that rituximab actually reduces the amount of kidney injury in patients with the disease.

In this study, Dr. Ruggenenti and his colleagues treated 50 patients with membranous nephropathy with rituximab. The investigators found that 10 of the patients event
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Contact: Shari Leventhal
sleventhal@asn-online.org
202-416-0658
American Society of Nephrology
Source:Eurekalert

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